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  <title>伪类选择符</title>
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    a{
        color:#F00;
        text-decoration: none;
     }
    a.hover{
       color:#F00;
       font-size:36px;
       background:#EEEEEE;
       border:1px dashed #F00;
     }
  a.visited{
        color:#000000;
  }
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</head>
<body>
   <p>点击这里访问：<a href="https://www.baidu.com/" target="_blank">百度</a></p>
</body>
</html>